Table of Contents

1. The Significance of Asymmetrical Sexual Isolation.- The Kaneshiro Models.- The Watanabe—Kawanishi Models.- Other Models.- Discussion.- References.- 2. Comments on “The Significance of Asymmetrical Sexual Isolation”.- References.- 3. The Significance of Asymmetrical Sexual Isolation and the Formation of New Species.- Other Models of Asymmetrical Sexual Isolation.- Empirical Data in Support of the Kaneshiro Model.- Male Choice or Female Choice?.- Mating Propensity and Sex Drive.- The Direction of Evolution in Hawaiian Drosophila.- Mating Asymmetries and Speciation.- Concluding Remarks.- References.- DNA Hybridization and Avian Systematics: Introduction.- 4. DNA Hybridization and Avian Phylogenetics.- From Organisms to Distances: The Data.- From DNA Distances to Trees: The Analytical Methods.- Discussion and Interpretation.- References.- 5. DNA Hybridization and Avian Phylogenetics: Reply to Cracraft.- References.- 6. DNA Evolutionary Implications of Phenotypic Plasticity in Plants.- The Nature of Phenotypic Plasticity.- Analysis of Phenotypic Expression.- The Genotypic Basis of Plasticity.- The Expression of Plasticity.- Evolutionary Responses to Environmental Heterogeneity.- What Is Fitness in Plants?.- Conclusions.- References.- 7. Deuterostome Monophyly and Phylogeny.- Deuterostomes.- Echinoderms.- Hemichordates.- Urochordates.- Cephalochordates.- Craniates.- Character Analysis.- Analysis and Comments.- Resumé.- Abbreviations.- References.- 8. Arvicolid Data (Arvicolidae, Rodentia) and Evolutionary Concepts.- Morphological Data.- Morphological Data and Arvicolid Phylogeny.- Chromosomal Data.- Biochemical Data.- Arvicolid Data and Speciation.- Arvicolid Data and Phyletic Gradualism.- Arvicolid Data and Stasis.- How Often? Relative Importance of AllopatricSpeciation, Phyletic Gradualism, and Stasis among Arvicolids.- Discussion: Arvicolid Data and Evolutionary Concepts.- Conclusion.- Summary.- References.- 9. Evolutionary Rates under Environmental Stress.- Stress and Natural Selection.- Variation under Stress.- Evolutionary Rates.- Conclusions.- Summary.- References.- 10. Cricket Life Cycles.- Life Cycle Types.- Egg Stage.- Nymphal Stage.- Adult Stage.- Geographical Adaptations.- Life Cycle and Speciation.- References.

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